Calculate the future value of an annuity, the total accumulated from a series of regular payments plus growth, at a given rate over time.
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For an ordinary annuity (payments at the end of each period): Future Value = Payment × [((1+r)^n − 1) ÷ r], where r is the interest rate per period and n is the total number of payments. An annuity due (payments at the start of each period) multiplies this result by (1+r), since each payment gets one extra period to grow.
For example, 500 monthly at 6% annual for 10 years grows to about 81,940 as an ordinary annuity, or about 82,349 as an annuity due.
Most loan and investment payments (like a 401(k) contribution deducted at month-end) are ordinary annuities. Annuity due is less common but applies when payments happen at the start of each period, like many lease or rent payments.
It's related but different, compound interest growth applies to a single lump sum, while an annuity involves a series of regular payments that each compound for a different length of time. This calculator combines both effects.
This calculator handles the accumulation phase, growing regular payments into a future lump sum. The Annuity Payout Calculator handles the reverse: starting with a lump sum and calculating a regular payout.
Annuity Payout Calculator
Calculate the regular payout a lump sum can provide over a set period.
Future Value Calculator
Calculate how much a present sum plus monthly contributions will be worth in the future.
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